I have 4 Drives, 2 external, 2 internal 90% of the time when i am copying videos from 1 drive to another my computer struggles immensly, it isnt exactly fast but it opk and also if i try to move more than 1 file at a time it freezes and causes my entire computer to crash. very rarely though its fine and i can move 100's of GB of data easily it makes no sense! please help.